<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>后代选择器</title>
    <style>
        ul li {
            color: aliceblue;
        }
        div ol li{
            color: red;
        }
    </style>

</head>

<body>
    <div>
        <ul>
            <li>1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
        </ul>
    </div>
    <div>
        <ol>
            <li>5</li>
        </ol>
    </div>
</body>

</html>